Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4cd03cc88f5efd…

MALICIOUS

PDF

78.9 KB Created: 2021-01-18 15:28:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7888753632783b9cc2eee422f765496d SHA-1: 1e1e0cef257e6804e83447bb4df3003136e66d67 SHA-256: 8b4cd03cc88f5efdb8941812fe48c868944891492beefddd293136a669088c69
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. One of the embedded URLs, 'https://trafficel.ru/123?utm_term=bfa+dungeons+guide', suggests a potential lure or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/123?utm_term=bfa+dungeons+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5fbce84756bd5.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/4103467.pdfIn PDF document text
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/8038178.pdfIn PDF document text
    • https://zenijubam.weebly.com/uploads/1/3/4/8/134884092/7028628.pdfIn PDF document text
    • https://gesofomudejow.weebly.com/uploads/1/3/4/3/134344239/a828c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_5fa12251658a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_5fb5a47d87e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_5fd28becc671e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5fca6c43e14bd.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/ebeb42e62.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/baganobuzoxetog.pdfIn PDF document text
    • https://zitavuzan.weebly.com/uploads/1/3/1/3/131379524/6191335.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/jbniXjf/25541514784.pdfIn PDF document text
    • http://faketikus.22web.org/63356325557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/minabiwa/16076139162.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 4996 bytes
SHA-256: 7de8734f7d7286c74b00b0eb4d93efb245be82cf57a039c080523b38f16889fa
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10492 bytes
SHA-256: b3eed5e48b635083358c3548a76350a472cf4304f1b857673086ce9074079a17

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